Ok after several weeks of this I can share
Start moan.
While the idea that ALL iot devices should sit on an iot vlan SONOS resists that to its maximum.
The iot vlan only has one basic change over a standard LAN in this instance (was planning on tightening up further later) was that ONLY the HOME network could open connections to the IOT vlan not the other way around.
- Changing the wifi that Sonos uses is a a REAL PAIN INTHE ASS and you have to allow up to 2 hours per SONOS device to do it. It will require following instruction that do not work, Press and Hold these two buttons until you hear a chime, after 60 seconds no chime, start all over again. Connecting to SONOS wifi - failed move closer to device - ANY CLOSER and I would be INSIDE the SONOS.
- These games will go one for a few hours - with 7 devices changing the WIFi took two days!!!
- It should NEVER be this hard.
- Once completed AIRPLAY & Alexa works great between networks but SONOS stubbornly refuses to work at all for playing Music.
- So migrate everything back through the SONOS torture.
- This time it forces me to rest all devices back to Factory as the migrate back to the home LAN was repeatedly failing.
- As I reset each device back to Factory they connect fine but when it comes to setup they fail and forces another reset back to factory.
- I am resigned to spending the whole weekend resetting to factory again and again and again to get these working.
So not sure if the working on the vlan is a UNIFI issue or a SONOS issue - it is an issue.
BUT ALL ON SONOS for it being so incredibly hard to change wifi made 1000 times harder by the SONOS being so flakey at setup.
The irony here is the Echo devices made this really easy.
Certainly taken the shine off SONOS.
End moan.